JPH03210545A - Finder for camera - Google Patents

Abstract

PURPOSE:To simply and accurately set up a photographing distance even at the time of using a fixed focusing camera by using a photographing state display member appearing in a part of a finder field also for a range finding means for setting up the photographing distance at the time of switching the camera to a close-up photographing enabled state. CONSTITUTION:When a photographer moves a switching control 11 in the arrow (a) direction to set up the control 11 to a close-up photographing position, a photographing distance changing lever 12 is moved also in the (a) direction and a cam shaft 16 is pressed. Thereby, a photographing lens 13 is moved in the optical axis direction by a cam groove 15a while rotating in an outer cylinder 15 together with a supporting cylinder 14 and set up on a position capable of applying a close-up photographing distance to the lens 13. In this case, the photographing state switching member 12 to be entered into the finder field is provided with a range finding part 12 set up so as to correspond to the rear size of a finder image to use the range finding part 12 as a range finding means. Consequently, the fixed focusing camera can simply and surely set up the photographing distance even at the time of close-up photographing.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a camera that enables close-up photography by changing the photographing distance by moving the photographing lens, and in particular to a finder for a fixed-focus camera. .

<Prior Art> Conventionally, some fixed-focus cameras have a frame 1=a for photographing a person in its finder F, as shown in FIG.

Such a camera was designed so that if the photographing distance was set such that the size of the frame Fa in the finder F matched the size of the person's face, the photographic optical system would come within the focusing range.

Furthermore, as a fixed focus camera, there was a camera that was capable of close-up imaging and had a mechanism as shown in FIG.

That is, during close-up photography, when the member 2 moves in the direction of arrow a by pushing the switching knob 1 in the direction of arrow a, the photographing lens 3 rotates in the outer cylinder 5 together with the holding cylinder 4 by the action of the cam engagement mechanism 6. While moving, the light moves in one direction and the shooting distance is changed.

Therefore, in order to notify whether the photographing optical system is in close-up shooting mode or normal shooting mode, a warning display member 2a formed at one end of the member 2 is attached to the eyepiece so that it is visible within the viewfinder field of view only during close-up shooting. 7 and the objective lens 8. Therefore, when the photographer sees the warning on the warning display member 7 in the finder, he or she sets the close-up shooting distance in percentages and takes a picture.

<Problems to be Solved by the Invention> By the way, in the conventional example described above, it has been found that as the photographing distance becomes shorter, the range of focus (in the front and back direction of the subject) becomes narrower.

Therefore, in order to prevent out-of-focus during close-up photography, the finder of the above-mentioned fixed-focus camera needs to have a distance measuring means that allows the photographer to set the photographing distance as accurately as possible.

As a means of achieving this, if you use a conventional finder with a frame-based distance-measuring means, you will not always be photographing objects of a certain size due to the nature of close-up photography, so it is undesirable to limit the frame. It is possible.

Even if it could be limited, the close-up distance measurement frame, which is not relevant for shooting other than close-up shots, would always be in the finder, making it difficult to see the finder and greatly reducing usability.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a finder for a fixed-focus camera that can easily and reliably set the photographing distance even during close-up photography.

Means for Solving the Problems> In order to achieve the above object, the finder of the camera of the present invention has a photographing state switching member that enters the field of view of the finder during close-up photography so as to correspond to the actual size of the finder image. A set distance measuring section is provided, and the distance measuring section is used as a distance measuring means.

<Function> The present invention configured as described above is a distance measuring unit provided on a member that enters the viewfinder field of view, and by aligning the scale with the thumb of the photographer who knows the actual size in advance, the shooting distance can be determined during close-up photography. can be set. Therefore, it is possible to quantitatively set the shooting distance during close-up photography, which has been done manually up until now.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

FIG. 1 is a block diagram of the main parts of a fixed-focus camera capable of close-up photography, and FIG. 2 is a perspective view of its appearance.

In the figure, 10 is a fixed focus camera, 11 is a normal photography (
N) and close-up photography (M) mode switching knob 12 is a shooting distance changing lever, which is coupled to the switching knob 11 and moves in the direction of arrow a perpendicular to the optical axis or in the opposite direction;
A distance measuring scale 12a is formed at one end and serves as a shooting state display, which enters into the field of view of a finder system (to be described later) during close-up shooting. 13 is a photographing lens; 14 is the photographing lens 13;
It is movably fitted into the outer cylinder 15, and the cam shaft 16 protruding from the outer periphery fits into the cam groove 158 formed in the outer cylinder 15, and the shooting distance changing lever 12 The arm portion 12b is pivotally supported at one end of the arm portion 12b provided at the lower edge of the arm portion 12b.

Further, the finder optical system is composed of an eyepiece lens 17 and an objective lens 18, and the finder optical path is as shown in FIG. 3. Therefore, the size relationship between the finder image and the real image in close-up photography is The distance measurement scale 12a is easily determined by proportional calculation or the like, and the distance measuring scale 12a is set based on this.

In this embodiment with the above configuration, when performing close-up photography, when the photographer moves the switching knob 11 in the direction of arrow a to set the close-up photography position, the photography distance change lever 12 also moves in the direction of arrow a, and the cam shaft Press 16. Through this operation, the photographing lens 13 is moved in the optical axis direction by the cam groove 15a while rotating within the outer cylinder 15 together with the support cylinder 14, and is set at a position that provides a photographing distance for close-up photography.

At this time, as shown in FIG. 4, the distance measuring scale 12a formed on the photographing distance changing lever 12 enters the finder field of view F at its negative edge.

Therefore, the photographer places an object whose actual size has been measured in advance, for example, his thumb B, right next to the subject A as shown in FIG. In this state, if you look through the finder and adjust the distance between the camera 10 and the subject A so that the size of the thumb B matches the distance measurement scale 12a as shown in Figure 6, the shooting distance will be almost accurate. This allows you to take good close-up shots.

FIGS. 7 and 8 show other embodiments of the present invention. In order to simplify the explanation, the same parts as in the previous embodiment are given the same reference numerals, and only the different points will be explained.

In this embodiment, the distance measuring unit 1 corresponds to the distance measuring scale of the shooting change lever 12 that enters the viewfinder field of view F during close-up shooting.
2a' and a lens cap C (with a protrusion C1 for distance measurement reference) set to a width P such that when the correct shooting distance is taken, the same size O is in the viewfinder field of view.
Fig. 8) is used. The other configurations are the same as those of the previous embodiment.

In this embodiment with the above configuration, the photographing distance can be set simply and accurately as in the previous embodiment.

<Effects of the Invention> As explained above, the present invention uses the shooting state display member that appears in a part of the field of view of the finder when switching to the close-up shooting state as the distance measuring means for setting the shooting distance. , even with fixed-focus cameras, without increasing manufacturing costs or making the viewfinder less usable during normal shooting.
This has the effect of allowing you to easily set an accurate shooting distance.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway schematic configuration diagram of the main parts of a fixed focus camera according to an embodiment of the present invention, and FIG. 2 is a sonder optical path diagram.
Figure 4 is a viewfinder field view in close-up shooting condition, Figure 5
The figure is an explanatory diagram for close-up photography, FIG. 6 is a viewfinder field of view during close-up photography as shown in FIG. 5, FIG. A perspective view of a lens cap used for distance measurement during close-up photography, Figure 9 is a view of the use of a finder with a frame for photographing people in a conventional fixed-focus camera, and Figure 10 is a view of its fixed focus for close-up photography. FIG. 2 is a partially cutaway schematic configuration diagram of the main parts of the camera. DESCRIPTION OF SYMBOLS 10...Fixed focus camera, 11...Mode switching knob, 12...Shooting distance change lever which also serves as a shooting display member 12a...Distance measuring unit (distance measuring scale), 12a'...
Distance measuring unit, 13...Photographing lens, 14...Support tube, 1
5... Outer cylinder, 15a... Cam groove, 16... Cam shaft, 17... Eyepiece lens, 18... Objective lens, A.
...Subject, B...Thumb, C...Lens cap, 1...Protrusion for distance measurement reference. Figure 11

Claims (1)

[Claims] 1. The photographing state switching member enters into the viewfinder only during close-up photography, and a distance measuring section set to correspond to the actual size of the finder image is provided in the entry portion, and the distance measuring section is set to enter the viewfinder only during close-up photography. A camera finder characterized in that it can be used as a distance measuring means.